Nerdsniper

Search modifiers:

gender:F or gender:M or gender:F,0.7
search for people based on predicted gender, optionally specify
how confident my algorithm should be. (default confidence: 0.7)

lang:en, lang:jp etc
filter results based on user language, supported languages are listed here
If no langauge is specified, a default of english (en) is used.

read our about page for more info about nerdsniper